#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define USER "USER"

int main()
{

    char* who = getenv(USER); 
    if(strcmp(who,"root") == 0)
    {
        printf("%s\n",who);
        printf("%s\n",who);
        printf("%s\n",who);
        printf("%s\n",who);
        printf("%s\n",who);
        printf("%s\n",who);
    }
    else
    {
       printf("权限不足\n");
       // printf("%s\n",who);
    }


    return 0;
}
